FAS and infection: Thus, our focus was to assess whether the polymorphism would be associated with infection by M. tuberculosis and the development of tuberculosis in our population, since other individuals from the same geographic population showed an association with the frequency of the polymorphism FAS -670 A/G with HLTV-1 infection and the development of disease symptoms [33], but frequency was unrelated to HBV and HIV infection [34,35].